From: Heiko Carstens <heiko.carstens@de.ibm.com> To: Elena Reshetova <elena.reshetova@intel.com> Cc: linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, x86@kernel.org, sparclinux@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, peterz@infradead.org, gregkh@linuxfoundation.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, tony.luck@intel.com, hpa@zytor.com, Hans Liljestrand <ishkamiel@gmail.com>, Kees Cook <keescook@chromium.org>, David Windsor <dwindsor@gmail.com> Subject: Re: [PATCH 1/4] s390: convert debug_info.ref_count from atomic_t to refcount_t Date: Mon, 20 Feb 2017 14:24:24 +0100 [thread overview] Message-ID: <20170220132424.GA5656@osiris> (raw) In-Reply-To: <1487588781-15123-2-git-send-email-elena.reshetova@intel.com> On Mon, Feb 20, 2017 at 01:06:18PM +0200, Elena Reshetova wrote: > refcount_t type and corresponding API should be > used instead of atomic_t when the variable is used as > a reference counter. This allows to avoid accidental > refcounter overflows that might lead to use-after-free > situations. > > Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> > Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> > Signed-off-by: Kees Cook <keescook@chromium.org> > Signed-off-by: David Windsor <dwindsor@gmail.com> > --- > arch/s390/include/asm/debug.h | 3 ++- > arch/s390/kernel/debug.c | 8 ++++---- > 2 files changed, 6 insertions(+), 5 deletions(-) I can only see a pull request from Ingo a couple of hours ago for Peter's refcount code. So the refcount code is not merged yet. It would have been good if you would have waited until it is really merged to avoid confusion. > @@ -361,7 +361,7 @@ debug_info_create(const char *name, int pages_per_area, int nr_areas, > debug_area_last = rc; > rc->next = NULL; > > - debug_info_get(rc); > + refcount_set(&rc->ref_count, 1); This is not wrong, but I will remove this hunk before applying your patch, since this doesn't look like an obvious correct change at first glance. Thanks, Heiko
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From: Heiko Carstens <heiko.carstens@de.ibm.com> To: Elena Reshetova <elena.reshetova@intel.com> Cc: linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, x86@kernel.org, sparclinux@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, peterz@infradead.org, gregkh@linuxfoundation.org, davem@davemloft.net, tglx@linutronix.de, mingo@redhat.com, tony.luck@intel.com, hpa@zytor.com, Hans Liljestrand <ishkamiel@gmail.com>, Kees Cook <keescook@chromium.org>, David Windsor <dwindsor@gmail.com> Subject: Re: [PATCH 1/4] s390: convert debug_info.ref_count from atomic_t to refcount_t Date: Mon, 20 Feb 2017 13:24:24 +0000 [thread overview] Message-ID: <20170220132424.GA5656@osiris> (raw) In-Reply-To: <1487588781-15123-2-git-send-email-elena.reshetova@intel.com> On Mon, Feb 20, 2017 at 01:06:18PM +0200, Elena Reshetova wrote: > refcount_t type and corresponding API should be > used instead of atomic_t when the variable is used as > a reference counter. This allows to avoid accidental > refcounter overflows that might lead to use-after-free > situations. > > Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> > Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> > Signed-off-by: Kees Cook <keescook@chromium.org> > Signed-off-by: David Windsor <dwindsor@gmail.com> > --- > arch/s390/include/asm/debug.h | 3 ++- > arch/s390/kernel/debug.c | 8 ++++---- > 2 files changed, 6 insertions(+), 5 deletions(-) I can only see a pull request from Ingo a couple of hours ago for Peter's refcount code. So the refcount code is not merged yet. It would have been good if you would have waited until it is really merged to avoid confusion. > @@ -361,7 +361,7 @@ debug_info_create(const char *name, int pages_per_area, int nr_areas, > debug_area_last = rc; > rc->next = NULL; > > - debug_info_get(rc); > + refcount_set(&rc->ref_count, 1); This is not wrong, but I will remove this hunk before applying your patch, since this doesn't look like an obvious correct change at first glance. Thanks, Heiko
next prev parent reply other threads:[~2017-02-20 13:24 UTC|newest] Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-02-20 11:06 [PATCH 0/4] arch subsystem refcounter conversions Elena Reshetova 2017-02-20 11:06 ` Elena Reshetova 2017-02-20 11:06 ` [PATCH 1/4] s390: convert debug_info.ref_count from atomic_t to refcount_t Elena Reshetova 2017-02-20 11:06 ` Elena Reshetova 2017-02-20 13:24 ` Heiko Carstens [this message] 2017-02-20 13:24 ` Heiko Carstens 2017-02-20 13:34 ` Heiko Carstens 2017-02-20 13:34 ` Heiko Carstens 2017-02-20 13:35 ` Reshetova, Elena 2017-02-20 13:39 ` Peter Zijlstra 2017-02-20 13:39 ` Peter Zijlstra 2017-02-20 11:06 ` [PATCH 2/4] x86: convert threshold_bank.cpus " Elena Reshetova 2017-02-20 11:06 ` Elena Reshetova 2017-02-20 11:17 ` Borislav Petkov 2017-02-20 11:17 ` Borislav Petkov 2017-02-20 12:20 ` Reshetova, Elena 2017-02-20 12:20 ` Reshetova, Elena 2017-02-20 12:30 ` Borislav Petkov 2017-02-20 12:30 ` Borislav Petkov 2017-02-21 20:45 ` Kees Cook 2017-02-21 20:45 ` Kees Cook 2017-02-22 9:27 ` Borislav Petkov 2017-02-22 9:27 ` Borislav Petkov 2017-02-20 11:06 ` [PATCH 3/4] sparc: convert mdesc_handle.refcnt " Elena Reshetova 2017-02-20 11:06 ` Elena Reshetova 2017-02-20 14:56 ` David Miller 2017-02-20 14:56 ` David Miller 2017-04-03 7:28 ` Reshetova, Elena 2017-04-03 7:28 ` Reshetova, Elena 2017-04-03 13:12 ` David Miller 2017-04-03 13:12 ` David Miller 2017-04-03 16:06 ` Reshetova, Elena 2017-04-03 16:06 ` Reshetova, Elena 2017-04-03 16:16 ` David Miller 2017-04-03 16:16 ` David Miller 2017-02-20 11:06 ` [PATCH 4/4] kvm: convert kvm.users_count " Elena Reshetova 2017-02-20 11:06 ` Elena Reshetova 2017-02-20 11:37 ` Paolo Bonzini 2017-02-20 11:37 ` Paolo Bonzini 2017-02-20 12:22 ` Reshetova, Elena 2017-02-20 12:22 ` Reshetova, Elena
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